Mathematics · Class 8

Data Handling

Grouped frequency tables, histograms, pie charts, and probability.

4 sections15–25 min read6 MCQs · 2 examples

Chapter Overview

Class 8 data handling introduces grouped frequency, histograms, pie charts, probability, and interpreting data from surveys, elections, and sports statistics.

Grouped Data

Class intervals: e.g. 0–10, 10–20
Histogram: bars for continuous classes (no gap)
Frequency polygon: line graph of midpoints

Pie Chart

Central angle = (frequency/total) × 360°. Used for budget breakdowns and survey results.

Probability

P(E) = Number of favourable outcomes / Total outcomes

Solved Examples

Step-by-step solutions — read each step before checking the final answer.

Example 1: Pie Chart Angle

In a class of 40, 10 play cricket. Central angle for cricket?

1Fraction = 10/40 = 1/4
2Angle = 1/4 × 360°

Answer

90°

Example 2: Probability

One card drawn from 52. P(red card)?

126 red cards
2P = 26/52

Answer

1/2

Key Points to Remember

✓ Histogram for grouped continuous data
✓ Pie chart shows proportion of whole
✓ Probability between 0 and 1

Exam Tips

• Calculate total frequency first
• Show fraction before angle in pie charts

Practice MCQs — Data Handling

Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.

Question 1 of 6Score: 0/0

Histogram bars touch because:

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